5. It is the prolonged heating of a metal at a selected temperature.
a. Annealing
b. Tempering
c. Age hardening
d. Soaking

6. In heat treatment process, it is the critical or transformation point at which pearlite structure is transformed into austenite structure.
a. Recalescence point
b. Decalescence point
c. Incandescence point
d. Phosphorescence point

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